VCO having voltage-to-current converter and PLL using same

Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled

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Details

331 14, 331 17, 331 34, 331 57, 331108B, 331177R, H03K 3354, H03L 707, H03L 7099

Patent

active

053592980

ABSTRACT:
The voltage controlled oscillator in a phase-locked loop comprises a voltage-current converter (62) and a current frequency converter (34). The voltage-current converter (62) comprises a voltage differential-current converter (64), a current-current converter (66) and a current adder-subtracter (68). In the voltage differential-current converter (64), only the voltage fluctuation or difference .DELTA.V.sub.CN with respect to one half a power supply voltage V.sub.DD /2, and not the absolute value of a control voltage V.sub.CN, undergoes current conversion as a control current I.sub.CN. Therefore, the center frequency of the oscillation frequency is not a factor of control voltage V.sub.CN and is controlled only by an offset voltage V.sub.B2. Accordingly, the center frequency can be independently set by changing offset voltage VB.sub.2. This is particularly significant in zone bit recording, which requires a wide frequency band.

REFERENCES:
patent: 4862015 (1989-08-01), Grandfield
patent: 5036216 (1991-07-01), Hohmann et al.
patent: 5075639 (1991-12-01), Taya

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